素代数上完全保k-交换性的映射

令A是实或复数域上含单位元I的素代数,k1是一个整数。文章证明了A上完全保k-交换性的满射Φ具有形式Φ=Φ(I)Ψ,其中Φ(I)∈Z(A)是可逆元,Ψ:A→A是环同构。上述结果应用于算子代数上,分别得到了因子von Neumann代数、Banach空间标准算子代数和矩阵代数上完全保k-交换性满射的具体刻画。     

一秩元集上完全保反对合性的可加映射

主要刻画了一秩元集上完全保反对合性的可加映射,证明了这样的映射是同构的常数倍或(复情形下)共轭同构的常数倍。对于映射Φ∶R→,对于每个n∈瓔,定义映射Φn为Φn((sij)n×n)=(Φ(sij))n×n.则如果Φn保反对合性,称Φ是n-保反对合性的;如果对于每个正整数n,Φ是n-保反对性的,则称Φ是完全保反对合性的。     

标准算子代数上保Jordan零积的可加映射

设A和B分别是无限维的实或复Banach空间X和Y上的标准算子代数,F(X)是X上的所有有限秩算子组成的代数。设Φ:A→B是一个保单位的可加满射。文章在对Φ的值域range(Φ)附加条件比较弱的假设下证明了映射Φ单边保Jordan零积(AB+BA=0→Φ(A)Φ(B)+Φ(B)Φ(A)=0),则要么Φ|F(X)=0,要么Φ是下面四种形式之一:代数同构,共轭代数同构,代数反同构,以及共轭代数反同构。     

(B)((H))上保正交性的可加映射

讨论了B（H）到B（H）上保反正交性、保Jordan正交性的可加映射，其中B（H）和B（H）是由Hilbert空间B和H上的有界线性算子全体组成的Banach代数．若Φ：B（H）→B（H）是双边保反正交性的可加满射，使得Φ（I）=I，并且对每个一秩幂等算子P∈B（H），有Φ（FP）包启FΦ（P），则Φ是B（H）上的＊-反同构或共轭＊-反同构．与保反正交性的假设条件相同，对于保Jordan正交性，得到Φ是下列形式之一：＊-同构，共轭＊-同构，＊-反同构，共轭＊-反同构．     

(B(H))上保交换零积的可加映射

讨论了B(H)上保交换零积的可加映射,其中B(H)是由Hilbert空间H上的有界线性算子全体组成的Banach代数。首先给出了在有限维情形下,若Φ是保交换零积的可加满射,使得Φ(I)=I,并且对每个一秩幂等算子P∈Mn都有Φ(FΦ)FΦ(P),则Φ是一个自同构或反自同构。进一步给出了无限维情形下,若Φ是保交换零积可加满射,则Φ是非零数乘一个环同构或一个环反同构。     

因子von Neumann代数上ξ-*-Lie同构的特征

设H和K是复Hilbert空间,A和B分别是H和K上的维数大于1的因子von Neumann代数。设Φ:A→B是双射且满足条件Φ(A*B-ξB*A)=Φ(A)*Φ(B)-ξΦ(B)*Φ(A),?A、B∈A。证明了以下三个结论:(1)当ξ=0时,Φ是线性或共轭线性*-同构;(2)当ξ∈R/{0,1,-1}时,若Φ保单位元,则Φ是线性或共轭线性*-同构;(3)当ξ∈C/R,若Φ保单位元,则Φ是线性*-同构。     

素环上的环同构及完全保交换性映射

令R是含单位元的素环,则R到其自身的每个完全保交换性的满射Φ都具有形式Φ=LC°π,其中C∈Z(R)是可逆元,π是R的环同构。令R是含单位元的素对合环,其对合运算记为*,则R到其自身的每个完全保斜交换性的满射Φ都具有形式Φ=LC°π,其中C∈Z(R)是可逆对称元,π是R的*-环同构。如果映射是保单位元的,则上述结果中环为素的假设可以去掉,即一般环(对合环)上的满射是环同构(对合环同构)当且仅当它是保单位的且完全双边保交换性(斜交换性)的。上述结果应用到算子代数,获得C*-代数、von Neumann代数、Banach空间标准算子代数、Krein空间不定自伴标准算子代数以及对称标准算子代数上完全保交换性或斜交换性满射的具体刻画。对于标准算子代数的情形,映射为满射的条件可以减弱为值域包含所有的一秩幂等算子。     

B(H)上保约当正交的线性映射

设H和K是复Hilbert空间,B(H)和B(K)分别是H和K上有界线性算子全体组成的Banach代数.讨论了Φ:B(H)→B(K)是保单位的线性满射,则Φ双边保约当正交当且仅当Φ是*-同构或*-反同构.     

椭圆包层型保偏光纤的设计与研制

从理论分析、结构分析和工艺制备方面介绍了椭圆包层型保偏光纤的研制,阐述了这种光纤在实际应用中的优良性能,重点介绍了Φ45椭圆包层型保偏光纤的制备。     

锚索动载荷拉脱(断)火花引爆瓦斯试验

利用专门研制的锚索冲击拉伸实验装置,在瓦斯浓度和氧气浓度满足瓦斯爆炸的条件下,对Φ15.24mm、Φ17.8mm和Φ21.6mm锚索在动载荷作用下拉脱(断)时产生火花引爆瓦斯的可能性进行了一系列实验研究。结果表明:锚索在动载荷作用下主要产生拉断、拉脱、脱断3种破坏形式,且破断处均发生于锚具固定端。采用红外热成像仪对锚索在动载荷作用下破坏产生的火花温度测试表明,锚索不论以何种形式破坏,其产生火花的最高温度远低于瓦斯爆炸所需要的最低温度650～750℃。而且,火花存在时间远小于瓦斯爆炸感应期。因此,Φ15.24mm、Φ17.8mm和Φ21.6mm锚索不论以何种形式破坏所产生的火花都不能引起瓦斯爆炸。     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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An on-line scaling method for improving scalability of a database cluster

The explosive growth of the Internet and database applications has driven database to be more scalable and available, and able to support on-line scaling without interrupting service. To support more client's queries without downtime and degrading the response time, more nodes have to be scaled up while the database is running. This paper presents the overview of scalable and available database that satisfies the above characteristics. And we propose a novel on-line scaling method. Our method improves the existing on-line scaling method for fast response time and higher throughputs. Our proposed method reduces unnecessary network use, i.e. , we decrease the number of data copy by reusing the backup data. Also, our on-line scaling operation can be processed parallel by selecting adequate nodes as new node. Our performance study shows that our method results in significant reduction in data copy time.     

An improved R-tree based on childnode''s probability

R-Tree is a good structure for spatial searching. But in this indexing structure,either the sequence of nodes in the same level or sequence of traveling these nodes when queries are made is random. Since the possibility that the object appears in different MBR which have the same parents node is different, if we make the subnode who has the most possibility be traveled first, the time cost will be decreased in most of the cases. In some case, the possibility of a point belong to a rectangle will shows direct proportion with the size of the rectangle. But this conclusion is based on an assumption that the objects are symmetrically distributing in the area and this assumption is not always coming into existence. Now we found a more direct parameter to scale the possibility and made a little change on the structure of R-tree, to increase the possibility of founding the satisfying answer in the front sub trees. We names this structure probability based arranged R-tree (PBAR-tree).     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Integrating GIS Web services based on mediating architecture

The geographic information service is enabled by the advancements in general Web service technology and the focused efforts of the OGC in defining XML-based Web GIS service. Based on these models, this paper addresses the issue of services chaining,the process of combining or pipelining results from several interoperable GIS Web Services to create a customized solution. This paper presents a mediated chaining architecture in which a specific service takes responsibility for performing the process that describes a service chain. We designed the Spatial Information Process Language (SIPL) for dynamic modeling and describing the service chain, also a prototype of the Spatial Information Process Execution Engine (SIPEE) is implemented for executing processes written in SIPL. Discussion of measures to improve the functionality and performance of such system will be included.